Toyota Tundra Service Manual: System Description

SYSTEM DESCRIPTION

1. GENERAL

(a) The blind spot monitor system has the blind spot monitor function and RCTA function.

(1) Blind spot monitor function

  • The blind spot monitor function is a function that assists the driver in making the decision to change lanes. The function uses quasi-millimeter wave radar to detect vehicles that are traveling in an adjacent lane in the area that is not reflected in the outer rear view mirror assembly. The function advises the driver of the existence of a vehicle by illuminating the outer rear view mirror indicator on the outer rear view mirror assembly.
  • If the turn signal switch is operated while the outer rear view mirror indicator on an outer rear view mirror assembly is illuminated, the indicator starts blinking to give additional warning to the driver.

(2) RCTA function

  • The RCTA function is a function that informs the driver of an approaching vehicle from diagonally behind. The function uses quasi-millimeter wave radar to detect the positions of and relative speed to a vehicle. When the function determines that a vehicle is approaching this vehicle, this function informs the driver of it using the indicators and buzzer.

2. FUNCTION OF COMPONENTS

Component

Function

Blind Spot Monitor Sensor

  • Consists of a 24 GHz radar module and an integrated processing module.
  • Illuminates or blinks the outer rear view mirror indicator on the outer rear view mirror assembly.
  • Sounds the RCTA buzzer (blind spot monitor buzzer) when the RCTA function is operating.
  • Changes the outer rear view mirror indicator on the outer rear view mirror assembly from illuminated to blinking when a turn signal switch operation signal is received from the windshield wiper switch assembly with the blind spot monitor function operating.
  • Dims the outer rear view mirror indicator on the outer rear view mirror assembly.

Outer Rear View Mirror Assembly

  • Outer Rear View Mirror Sub-assembly (Outer Rear View Mirror Indicator)

Turns on or blinks the indicator based on a signal from the blind spot monitor sensor.

Steering Pad Switch Assembly

  • Enables, disables or cuts off the operation of the blind spot monitor system by transmitting switch operation signals to the combination meter assembly.
  • Enables, disables or cuts off the operation of the RCTA function by transmitting switch operation signals to the combination meter assembly.

RCTA Buzzer (Blind Spot Monitor Buzzer)

Sounds based on a signal from the blind spot monitor sensor.

Combination Meter Assembly

  • Multi-information Display
  • Transmits the ON/OFF signal to the blind spot monitor sensor RH.
  • Transmits a turn signal switch operation signal from the headlight dimmer switch assembly to the blind spot monitor sensor via CAN communication.
  • Displays an error message on the multi-information display if the blind spot monitor detects a malfunction while it is operating.
  • Illuminates to inform the driver while the blind spot monitor system power is on (the ignition switch is ON and the blind spot monitor system is on)
  • Transmits the customize information on the multi-information display to the blind spot monitor sensor RH.

Main Body ECU (Multiplex Network Body ECU)

Transmits the destination information and the dimmer signal to the blind spot monitor sensor via CAN communication.

Skid Control ECU (Brake Actuator Assembly)

Transmits a vehicle speed signal to the blind spot monitor sensor via CAN communication.

ECM

Transmits the shift position signal (R) to the blind spot monitor sensor via CAN communication.

Spiral with Sensor Cable Sub-assembly

Detects the angle of the steering wheel and transmits the resulting signals to the blind spot monitor sensor via CAN communication.

Airbag Sensor Assembly

Transmits the yaw rate signal to the blind spot monitor sensor via CAN communication.

3. OPERATION DESCRIPTION

(a) Operation description of the blind spot monitor function

(1) Operation conditions

  • The blind spot monitor system is on.
  • Vehicle speed is more than approximately 16 km/h (10 mph).

(2) Conditions in which a sensor can detect a vehicle

The blind spot monitor function indicates detection of a vehicle in the detection area when either condition is met:

  • When a vehicle is detected in an adjacent lane overtaking this vehicle.
  • When a vehicle is detected entering the detection area because it changed lanes.

HINT:

The greater the difference in speed between the vehicle and the detected vehicle is, the farther away the other vehicle will be when the notification is given.

(3) Detection area

Vehicles in the following areas can be detected:

*a

Within approximately 3.5 m (11.48 ft.) from Side of Vehicle

*b

Within approximately 0.5 m (1.64 ft.) from Side of Vehicle

*c

Within approximately 1 m (3.28 ft.) Forward of Rear Bumper

*d

Within approximately 3 m (9.84 ft.) Behind Rear Bumper

*e

Within approximately 3 m (9.84 ft.) to 60 m (196.86 ft.) from Rear Bumper

Detection Area (for Vehicle in Blind Spot)

Detection Area (for Rapidly Approaching Vehicle from Behind)

(b) Operation description of the RCTA function.

(1) Operation conditions:

  • The RCTA function is on.
  • The shift lever is in R.
  • The vehicle speed is less than approximately 8 km/h (5 mph).

(2) Conditions in which a sensor can detect a vehicle

The RCTA function indicates detection of a vehicle in the detection area when both conditions are met:

  • A vehicle is approaching this vehicle from diagonally behind.
  • The vehicle speed is approximately 8 km/h (5 mph) to 28 km/h (18 mph).

(3) Detection area

Vehicles in the following areas can be detected:

*a

Within approximately 5.5 to 20 m (18.05 to 65.62 ft.) from Side of Vehicle (detection area changes according to vehicle speed)

*b

Within approximately 6 m (19.69 ft.) Behind Rear Bumper

Detection Area

4. OPERATION OF OUTER REAR VIEW MIRROR INDICATOR AND RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Initial check

(1) When the blind spot monitor system is turned on with the ignition switch ON, the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds.

(2) When the RCTA function is turned on with the ignition switch ON, the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 1 second.

(3) When the ignition switch is turned from off to ON with the blind spot monitor system on, the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds.

(b) Operation for each function

(1) Operation for blind spot monitor function

  • When a sensor detects a vehicle in the blind spot area, the outer rear view mirror indicator on the outer rear view mirror assembly illuminates.
  • While the sensor is detecting a vehicle in the detection area and the indicator is illuminated, if the turn signal switch is operated, the outer rear view mirror indicator on the outer rear view mirror assembly starts blinking as shown in the illustration.

(2) Operation for RCTA function

  • When all of the operation conditions for the RCTA function are met, the outer rear view mirror indicators on the outer rear view mirror assembly blink for 2.5 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 2.3 seconds as shown in the illustration.
Text in Illustration

*a

0.125 seconds

*b

2.5 seconds

*c

0.1 seconds

*d

0.4 seconds

*e

2.5 seconds

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    Problem Symptoms Table

    System Diagram

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